Speed-regulator.



No. 647,503 Patented Apr. I7, I900.

T. H. MACDONALD. SPEED REGULATOR.

. (Application filed Nov. 9, 1899.)

' (No Model.)

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ITED STATES PATENT OFFICE.

TIIOMAS I-I. MACDONALD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE AMERICAN GRAPI-IOPHONE COMPANY, OF WEST VIRGINIA.

SPEED-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 647,503, dated April 17, 1900.

Application filed November 9,1899. $erial No. 736,382- (N'o model.)

other machines where it is essential that the speed be absolutely uniform.

The usual governor employed with springmotors for graphophones consists of a revoluble shaft driven from the motor by a suitable intermediate train and having on it a fixed disk and a second disk that turns with the shaft, but is free to slide longitudinally thereon and connected to the fixed disk by flexible strips, each carrying a weight. The centrifugal force of the weights, bending the strips outward, moves the sliding disk along its shaft toward the fixed disk. This lon-. gitudinal movement of the sliding disk carries it against a friction-pad with a force and consequent friction proportioned to the rapidi'ty with which the governor is revolving. The friction-pad is carried on a lever so that it can be moved against the sliding disk and held there (by suitable means) with sufficient force to stop the rotations enti rely. A set-screw under the rearend of the lever provides for adjusting the position of the friction-pad when the lever is released. An objection to this construction lies in the fact that the brake applies its friction at the end of the intermediate train, so that while each tooth of the pinion on the governorshaft is turning there is a slight checking of the intermediate train, followed by a correspondingacceleration as the tooth is released. This produces an intermittent audible jarring that interferes with satisfactory sound reproduction by the graphophone. My invention avoids this objection by applying the greater part of the friction to a Wheel or other moving part of the power-transmitting train at a point nearer to the motor, which I accomplish by having a lever with a pad at each end, one of which is shifted by the longitudinal sliding of the disk of the governor so as to force the other against the wheeler other movable member to which it is to be applied.

In the drawings annexed hereto, Figure 1 is a plan View showing my invention applied to the governor of an ordinary graphophone, and Fig. 2 is an elevation viewed from the broken line X X in Fig. 1.

In my device A is the front portion of the middle bearing-plate of an ordinary graphophone. Bis a shaft passing through this plate and connected on the other (far) side thereof with the spring-motor by the usual train of gears. On shaft B is fast the large gear C and also the drum for carrying belt I), which rotates the mandrel. (Not shown.)

D is the shaft of the usual governor, driven through a pinion C by gear C.

E is the longitudinally-slidable frictiondisk that turns with shaft D.

F is a lever pivoted, as at f, and carrying at its end lever G, which is shown as pivoted at G about one-third of the distance from its end, so that the friction-pad g at the end of its longer arm shall be opposite slidable disk E, while f riction-pad g on the end of the shorter arm is opposite gear C. The outer face of lever F is inclined upward away from plate A, and lever H (with handle II) is pivoted to the plate A at h, so that its outer end plays over the inclined end of lever F. A setscrew A turns through plate A against the lower side of lever F at the end f.

The mode of operation is as follows: When the lever H is turned into the position shown in Fig. 2, it. forces the end of lever F down toward plate A, so that pads g g are held against disk E and gear 0 with sufficient force to stop all rotation. When the lever H is moved in the direction indicated by the arrow, lever F is free to be moved away from plate A, and the pads g g are pushed aside by the revolution of disk E and gear C. As the speed increases sliding disk E moves longitudinally along its shaft D away from plate A and bears against pad g. The immediate result of this is to swing pad 9 out and force pad g against gear C with approximately double force. When the speed has reached the maximum desired, both pads are operating as friction-brakes; but on account of the leverage the greatest friction is applied to gear 0. Another result of this construction is that the slightest longitudinal movement of disk E is translated with double force into friction against gear 0.

Of course this invention is not limited to use with spring-motors or for graphophones, nor do I limit myself to the exact construction shown. For instance, friction-pad g may be applied to any other moving part of the intermediate train and the proportions and exact arrangement of parts may be altered without departing from the spirit of my invention.

Having thus described my invention, I claim 1. 'lhe herein-described automatic speedregulator for governors, comprising a longitndinally-slidable disk turning with the governor-shaft, a train from the motor for driving said shaft, and a lever whose two arms lie opposite respectively to said disk and to an intermediate member of said train, said lever being so mounted that the longitudinal movement of said disk causes said lever to bear against both said disk and said intermediate member, substantially as described.

2. The herein-described automatic speedregulator for governors, comprising a longitudinally-slidable disk turning with the governor-shaft, a train from the motor for driving said shaft, and a lever whose two arms lie opposite respectively to said disk and to an intermediate member of said train, said lever being so mounted that the longitudinal movement of said disk causes said lever to bear against both said disk and said intermediate member, in combination with means for' forcing said lever down to lock said disk and intermediate member, substantially as described.

3. In a governor for motors, the combination of a lever having a friction-pad at each end, a device for transmitting motion to the revoluble shaft of the governor, the longitudinally-slidable disk turning with said shaft and operating by its longitudinal movement to bear against the end of the longer arm of said lever and thereby force the end of the shorter arm thereof against said motion-trans mitting device, substantially as described.

at. In combination with the friction-disk of a governor, and the gear-wheel driving the same, the lever carrying at its end a second lever adapted to bear against said disk and wheel respectively, and a third lever adapted to force said first lever down and thereby cause said second lever to lock said disk and gear, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

THOMAS H. MACDONALD.

Witnesses:

M. A. Foco, A. B. KEoUcH. 

